English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the zaia usage as premium feature

ZAIA

Presents the pdf analysis as premium feature

PDF Analysis

Insights

Presents the summarisation as premium feature

Summarisation

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the access of premium content as premium feature

Premium Content

Zendy Tools

Zendy Open

Protocaseyite, [Al 4 (OH) 6 (H 2 O) 12 ][V 10 O 28 ]·8H 2 O, is a new mineral (IMA2020-090) occurring in low-temperature, post-mining, secondary mineral assemblages at the Burro mine, Slick Rock district, San Miguel County, Colorado, U.S.A. Crystals of protocaseyite are safron-yellow, thick blades, with pale orange-yellow streak, vitreous luster, brittle tenacity, curved fracture, two very good cleavages, a Mohs hardness of 2, and a density of 2.45(2) g/cm 3 . The optical properties of protocaseyite could be only partly determined: biaxial with α = 1.755(5), β &lt; 1.80, γ &gt; 1.80 (white light); pleochroic with  X  and  Y  yellow,  Z  orange ( X  ≈  Y  &lt;  Z ). Electron-probe microanalysis and crystal-structure solution and refinement provided the empirical formula [(Al 3.89 Mg 0.11 Ca 0.02 ) Σ4.02 (OH) 6 (H 2 O) 12 ][H 0.06 V 10 O 28 ]·8H 2 O. Protocaseyite is triclinic,  P 1,  a  = 9.435(2),  b  = 10.742(3),  c  = 11.205(3) Å, α = 75.395(7), β = 71.057(10), γ = 81.286(6)°,  V  = 1036.4(5) Å 3 , and  Z  = 1. The crystal structure ( R  1  = 0.026 for 4032  I  o   &gt; 2 σ I  reflections) contains both the [V 10 O 28 ] 6−  decavanadate polyoxoanion and a novel [Al 4 (OH) 6 (H 2 O) 12 ] 6+  polyoxocation.

Protocaseyite, a new decavanadate mineral containing a [Al 4 (OH) 6 (H 2 O) 12 ] 6+ linear tetramer, a novel isopolycation